<template>
  <div class="treeTable">
    <el-table :data="formatData" border :row-style="showRow" v-bind="$attrs" :max-height="maxHeight?maxHeight:'10000'" @cell-click="cellclick" min-width='130'>
      <el-table-column v-if="columns.length===0" width="150" align='center'>
        <template slot-scope="scope">
          <div @click="toggleExpanded(scope.$index)">
            <span v-for="space in scope.row._level" :key="space" class="ms-tree-space" />
            <span v-if="iconShow(0,scope.row)" class="tree-ctrl">
              <i v-if="!scope.row._expanded" class="el-icon-plus" />
              <i v-else class="el-icon-minus" />
            </span>
            {{ scope.$index }}
          </div>
        </template>
      </el-table-column>
      <el-table-column v-for="(column, index) in columns" v-else :key="column.value" :label="column.text" :width="column.width" align='center'> 
        <template slot-scope="scope">
          <!-- Todo -->
          <!-- eslint-disable-next-line vue/no-confusing-v-for-v-if -->
          <div class="trstyle" @click="toggleExpanded(scope.$index)">
            <span v-for="space in scope.row._level" v-if="index === 0" :key="space" class="ms-tree-space" />
            <span v-if="iconShow(index,scope.row)" class="tree-ctrl">
              <i v-if="!scope.row._expanded" class="el-icon-plus" />
              <i v-else class="el-icon-minus" />
            </span>
            {{ scope.row[column.value] }}
          </div>
        </template>
      </el-table-column>
      <slot/>
    </el-table>
  </div>
</template>

<script>
import treeToArray from "./eval";
export default {
  data() {
    return {
      maxHeight: "650"
    };
  },
  name: "TreeTable",
  props: {
    /* eslint-disable */
    data: {
      type: [Array, Object],
      required: true
    },
    columns: {
      type: Array,
      default: () => []
    },
    evalFunc: Function,
    evalArgs: Array,
    expandAll: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    // 格式化数据源
    formatData: function() {
      let tmp;
      if (!Array.isArray(this.data)) {
        tmp = [this.data];
      } else {
        tmp = this.data;
      }
      const func = this.evalFunc || treeToArray;
      const args = this.evalArgs
        ? Array.concat([tmp, this.expandAll], this.evalArgs)
        : [tmp, this.expandAll];
      return func.apply(null, args);
    }
  },
  methods: {
    cellclick(row, column, cell, event) {
      if (column.label === "操作") {
        this.$parent.popflag = true;
        this.$emit("pop", row);
      }
    },
    showRow: function(row) {
      const show = row.row.parent
        ? row.row.parent._expanded && row.row.parent._show
        : true;
      row.row._show = show;
      return show
        ? "animation:treeTableShow 1s;-webkit-animation:treeTableShow 1s;"
        : "display:none;";
    },
    // 切换下级是否展开
    toggleExpanded: function(trIndex) {
      const record = this.formatData[trIndex];
      record._expanded = !record._expanded;
    },
    // 图标显示
    iconShow(index, record) {
      return index === 0 && record.children && record.children.length > 0;
    }
  }
};
</script>
<style rel="stylesheet/css">
@keyframes treeTableShow {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@-webkit-keyframes treeTableShow {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
</style>

<style>
.treeTable .el-table td:first-child{
  text-align: left;
  padding-left:20px;
}
.treeTable .el-table th{
  text-align: center !important;
}
.treeTable .el-table th .cell{
  color: white;
}
.el-icon-plus {
  border: 1px solid #aaa;
  color: #aaa;
}
.el-icon-minus {
  border: 1px solid #aaa;
  color: #aaa;
}
.trstyle {
  height: 48px;
  line-height: 48px;
}
.treeTable .el-table th {
  background: rgb(37, 40, 52);
}
.treeTable .el-table td {
  padding: 0;
}
.treeTable .el-table td:last-child {
  cursor: pointer;
}
.treeTable .el-table .cell {
  padding-left: 0;
  padding-right: 0;
}
.ms-tree-space {
  position: relative;
  top: 1px;
  display: inline-block;
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  width: 18px;
  height: 14px;
}
.ms-tree-space::before {
  content: "";
}
table td {
  line-height: 26px;
}
.tree-ctrl {
  position: relative;
  cursor: pointer;
  color: #2196f3;
  margin-left: -18px;
}
.treeTable td:last-child {
  color: #5286ff;
}
.el-table .cell, .el-table th div, .el-table--border td:first-child .cell, .el-table--border th:first-child .cell {
    padding-left: 0px;
}
</style>
